He’s obsessed with classic men’s fashion, Pinterest, Scandinavia, and architecture, so it’s only natural that we singled out Marcus Hamblin , a 28-year-old interior designer from the South End, as our Instagram style star of the week (find him at www.instagram.com/marcushamblin). Hamblin, who is in his final year at Boston Architectural College, plans to take over the fashion world after conquering interior design. As you can tell, he’s also quite humble and demure. His Instagram album is filled with well-curated details of his design obsessions. Time to find out what drives the self-professed “desigNerd” before he becomes a household name.